<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--
    文件上传三个要素

-->
<form method="post" action="/common/upload" enctype="multipart/form-data">
    <input name="file" type="file"  /><br>
    <input type="submit" value="提交" />
</form>
</body>
</html>